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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/macros/macro-pat-neg-lit.rs | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/macros/macro-pat-neg-lit.rs b/src/test/ui/macros/macro-pat-neg-lit.rs new file mode 100644 index 000000000..79c68fd25 --- /dev/null +++ b/src/test/ui/macros/macro-pat-neg-lit.rs @@ -0,0 +1,25 @@ +// run-pass +macro_rules! enum_number { + ($name:ident { $($variant:ident = $value:expr, )* }) => { + enum $name { + $($variant = $value,)* + } + + fn foo(value: i32) -> Option<$name> { + match value { + $( $value => Some($name::$variant), )* + _ => None + } + } + } +} + +enum_number!(Change { + Down = -1, + None = 0, + Up = 1, +}); + +fn main() { + if let Some(Change::Down) = foo(-1) {} else { panic!() } +} |